Question

what is triple point

Answer 1

In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. For example, the triple point of mercury occurs at a temperature of −38.83440 °C and a pressure of 0.2 mPa.

Answer 2

the triple point of substance is the temperature and pressure at which the three phases gas ,liqid and solid of the substance coexist in thermodynamic equilibrium